I have found that running 2 GTX 560 Ti's on my Asus A8N-SLI-Deluxe is a no-no. Production is reduced 4-6000 PPD for each card! GTX 460's, no problem.

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Yeah, CPU limitations hit the bigger cards pretty hard. A Pentium 4 HT 630 can only support about 1 GTX 460 maximum or it runs at 100% CPU and causes the GPU load to go all over the place. I think 2x GTX 460s on my X2 4400+ only used like 30-50% CPU though.

did they change the value on those, or is it just that your 580 gets a good QRB?

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All my cards are doing alot better on that wu. 2 of them didnt have the beta flag so changed them back. Gonna see what happens but the ones getting the 7662 are putting out way more than other wu. Had three cards shut down but gonna fire them back up. 46k on 580 40k on 570 both at 900 core and 32k on 480 at 750 core.

Since I sold my P55 system last Friday and it was running a GTX 465 and dual 460s, my 460s were offline until today. I found an old 250GB drive last used on an AMD Phenom II system, so I cobbled together my A8N32-SLI, an Athlon 64 3400+ single core (I have a delidded Opteron 170 but no working coolers to use it with atm) and 2GB ECC DDR-400. It's working at the least, although the single core (like my P4 630) gets bogged down by some .NET Runtime thing randomly. It seems to have ceased and the GPUs aren't being starved at the moment, so I guess it will be fine. I might consider a Haswell/Z87 upgrade for my main desktop and pass down this 3770K setup to work for distributed computing to replace the P55/i7-870 rig I no longer own if I can still run an additional rig.

I'm down about 9k PPD for now--the GTX550TI I had folding crapped out. It won't fold now and just displays garbage to the display--sadly, I don't think that warranty replacement is an option for it. I have another 8800GT going in its place (bringing me to 3 8800GTs, an 8800GTS G92, tw0 9600GSOs, and an 8800GS).